What is the area size used to calibrate hand sprayers in square feet?

• A. 100 ft²
• B. 400 ft²
• C. 25 ft²
• D. 144 ft²

Answer: (A)

Calibrating a hand sprayer is about measuring how much spray is delivered over a known area so you can adjust to the desired application rate. The standard test area is a 10-by-10-foot square, which equals 100 square feet. Spraying a measured amount onto that 100 ft² area and then determining how much liquid was dispensed lets you calculate the spray rate per 100 ft² and easily scale to larger areas (like per 1,000 ft²). The 100 ft² size is practical—large enough to average nozzle output across the area, but small enough to manage in a calibration setup.